* {
	margin: 0;
	padding: 0;
}
.flex-x {
	display: flex;
	justify-content: center;
}
.flex-b {
	display: flex;
	justify-content: space-between;
}
.flex-y {
	display: flex;
	align-items: center;
}
.flex-yy {
	display: flex;
	flex-direction: column;
}
.flex-w {
	flex-wrap: wrap;
}
.flex-s {
	display: flex;
	justify-content: start;
}
.abs {
	position: absolute;
}
.cf::before,
.cf::after {
	content: "";
	display: table;
	clear: both;
}
.rel {
	position: relative;
}
button {
	cursor: pointer;
}
a {
	text-decoration: none;
}
.container {
	width: 1200px;
	margin: 0 auto;
}
.cp {
	cursor: pointer;
}
.fw-b {
	font-weight: bolder;
}
.b-box {
	box-sizing: border-box;
}
.text-c {
	text-align: center;
}
.bigtitle {
	margin-top: 100px;
}
.bigtitle h1 {
	font-size: 38px;
	color: black;
	height: 50px;
	line-height: 50px;
}
.bigtitle p {
	height: 28px;
	line-height: 28px;
	color: #666666;
	font-size: 12px;
}
.bigtitle a {
	height: 50px;
	line-height: 50px;
	color: #4c99ff;
	font-size: 12px;
}
.ls {
	list-style: none;
}
.on {
	display: block;
}
.close {
	display: none;
}
